Here are 20 essential facts dog lovers must always remember. The last one made me cry so much.

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These 20 essential facts all dog lovers must always keep in mind were written by DogHeirs. These life lessons are sometimes easy to forget in our hectic lives, but when you remember that you are your dog’s whole world, these 20 truths are unforgettable.

1. A dog’s life is very short when compared to a human’s lifespan. While humans can live for more than 100 years, dogs may only live for 10-20 years. Make the time count.

3. Children who grow up with dogs are not only healthier but they are also more well-adjusted human beings. Studies have shown that kids who live with dogs have stronger immune systems, fewer allergies and possibly even healthier microbiomes. Other research has revealed that kids raised with dogs feel more caring, happy, responsible and intelligent. And dogs love their little humans just as much as they love their big humans.

4. Dog kisses may also improve your health! A new study aims to show that microbes exchanged between dogs and people may have a positive probiotic effect on the human body that affects our overall health.

6. Dogs just want to make their humans happy. Teaching dogs new tricks, challenges and behaviors strengthens the bond with your dog. Studies have shown that dogs bond with their humans in a similar way that babies do with their parents and naturally want to please them.

7. Dogs reduce stress. Dogs have been shown to decrease the risk of heart disease because they motivate people to get outside and take walks. Also the emotional bond owners feel towards their pets reduces their reaction to stress and lowers their heart rate.

10. Dogs are sensitive to the environment. They cannot be left outside when it is too hot or too cold. Leaving a dog outside without shelter in extreme weather could result in sickness or death. Similarly, leaving dogs in vehicles during the summer heat could kill them.

12. Dogs naturally want to comfort people who are upset. Scientists have shown that dogs respond to human tears and will naturally try and reassure a distressed person. Furthermore, dogs won’t just comfort their humans, they’ll also try to help strangers!

13. Dogs cannot be left alone for long periods of time. They are social animals and need people or other animals around them in order to not get lonely, suffer separation anxiety or act out with bad behavior. Dogs need to spend time interacting with their humans every single day.

16. Dogs thrive on encouragement. Positive reinforcement training has been shown to have far better results in modifying a dog’s behavior than harsh training methods. Researchers suggest training your dog well and early on to avoid any problems with aggression.

18. Dogs may display sudden changes in behavior due to illness. If your dogs are suddenly acting aggressively, or not wanting to walk or eat, it could mean they are sick or injured. Dogs don’t complain like humans, but a change in their regular behavior or routine could indicate there’s something wrong.

20. Dogs always refuse to leave their human’s side. There are countless reports of loyal dogs who stayed beside their humans when they were sick, injured and even deceased. Remember this when it’s time for your dog to cross the Rainbow Bridge.